BRS Bulk GFO Granular Ferric Oxide - High Capacity

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Quick Overview

High Capacity GFO is the best performing GFO we stock and capable of removing close to twice the phosphate as standard GFO by volume. We recommend this when you have a large tank or limited room in your media reactor.

Granular Ferric Oxide (GFO) removes phosphate from the aquarium and is one of the most commonly used filtration media used in the aquarium industry. GFO is one of the few ways to easily maintain ultra low phosphate levels on a consistent basis. Maintaining these ultra low levels will help prevent algae outbreaks as well as treat existing algae issues. Your aquarium's glass will also stay clear and free of the green hue significantly longer. GFO is most commonly used in a media reactor like the BRS reactor or media bag.

Phosphate inhibits proper coral growth by incorporating itself into the corals skeletal structure which makes it difficult for the coral to grow by laying down additional calcium and carbonate (alkalinity) ions. Maintaining ultra low phosphate levels will increase the growth of any SPS or LPS coral.

Algae outbreaks are one of the most common reasons for a complete tank shut down. We recommend preventing them by maintaining an ultra-low nutrient level environment where it would be difficult for them to get out of control to begin with. It is much easier to prevent outbreaks than it is to treat existing outbreaks.

High Capacity GFO is the best performing GFO we stock and capable of removing close to twice the phosphate as standard GFO by volume. We recommend this when you have a large tank or limited room in your media reactor.

Granular Ferric Oxide (GFO) removes phosphate from the aquarium and is one of the most commonly used filtration media used in the aquarium industry. GFO is one of the few ways to easily maintain ultra low phosphate levels on a consistent basis. Maintaining these ultra low levels will help prevent algae outbreaks as well as treat existing algae issues. Your aquarium's glass will also stay clear and free of the green hue significantly longer. GFO is most commonly used in a media reactor like the BRS reactor or media bag.

Phosphate inhibits proper coral growth by incorporating itself into the corals skeletal structure which makes it difficult for the coral to grow by laying down additional calcium and carbonate (alkalinity) ions. Maintaining ultra low phosphate levels will increase the growth of any SPS or LPS coral.

Algae outbreaks are one of the most common reasons for a complete tank shut down. We recommend preventing them by maintaining an ultra-low nutrient level environment where it would be difficult for them to get out of control to begin with. It is much easier to prevent outbreaks than it is to treat existing outbreaks.More

BRS Bulk GFO Granular Ferric Oxide - High Capacity

Two Types of GFO:

Granular GFO is varied in its shapes and requires the least amount of flow to tumble. Good for reactors.

High Capacity GFO is twice as dense as Granular GFO, so twice as much material will fit into a reactor. It's extremely hard and has less dust to begin with. Fewer fines will be created during use and transportation. By volume, High Capacity GFO will remove roughly twice the phosphate compared to the same volume of Granular GFO. Best overall performance.

Special note on fighting existing algae problems: Algae needs three main nutrients to grow: phosphate, nitrate and light. Reducing any one of these will significantly slow down algae growth but may not completely solve your issue. Once algae takes hold, it can be a difficult battle but it is winnable. The best offense against algae is to take preventative measures and attack nutrient before an outbreak is apparent. Use the following suggestions and be aggressive if an algae problem is already present:

Maintain undetectable phosphate levels with good feeding habits and use a phosphate remover like GFO. 99% of all phosphate is added to the tank via foods.

Control nitrate levels by reducing feedings, increasing the water change schedule and maintaining a properly sized protein skimmer.

Use nutrient free RO/DI water for water changes and top off water

Shorten your lighting period or intensity. In some cases aquarists have found replacing old bulbs that have fallen out of their intended spectrum helps as well.

Continuously remove as much algae as possible by hand.

Add predators - nothing helps an algae outbreak as much as critters who eat it all day long. Various tangs, lawn mower blennies, crabs and snails are all good options. It is also theorized that a healthy pod population will also control algae growth before it gets a chance to take root.

FRICKIN AWESOMEBy Wrath of Poseidonon 3/6/2015

i have lots of fish lots of corals in a 150g can go 2 months with out what changes

Very HappyBy Benjamin on 3/5/2015

Benjamin would recommend this product to a friend

Been running the HIgh Capacity GFO for two years in two different tanks. On my 90gal. I have the BRS dual reactor with GFO and Carbon. Since running the HIgh Capacity GFO, my phosphate levels are non existant.

Easy and efficient!By Tonyon 2/26/2015

Using with a mix of Rox carbon in my Deluxe BRS reactor and ran clear almost instantly!

Great startBy Kenon 2/14/2015

Ken would recommend this product to a friend

Its the perfect size to get your new GFO reactor off to a great start

Great product, but a bit $$By Submergeon 2/4/2015

Submerge would recommend this product to a friend

You get what you pay for. This GFO works well in a bag in the sump. It doesn't clump if kept in a high flow area. I just massage it around every few days for "general principle". It does a great job at keeping the phosphates low, about 1/10 of what they were before.

Amazing product!By Davidon 1/14/2015

David would recommend this product to a friend

I was continuing to have issues getting my Phosphates down to a negligible amount. I was dosing all sorts of products in an attempt to get the counts down. I installed a BRS Reactor with High Capacity GFO and crossed my fingers. I installed it three days ago and today my reading was 0.05! I can't say enough positive things about this product. Thank you BRS!

I'm sold, will never run without it.By Bruceon 12/14/2014

Bruce would recommend this product to a friend

Was having phosphate issues on my 90g mixed reef tank so I thought I'd give it a try after reading the other reviews....they were right! I am running a BRS single reactor and mix about 1 part High Capacity GFO & 2 parts BRS Premium ROX Carbon. After a week I was convinced my Hanna Checker was broken because it kept coming up 0 phosphates...there was nothing wrong with my Hanna. Been using this about 6 months now and have had no phosphate issues or no ill side effects. I didn't think I really needed the carbon but carbon is cheap and has it's benefits, and with the mix you don't have the hassle of tweaking the flow to try to maintain the right amount of tumble.

BRS BULK GFO-High CapacityBy mt88on 12/13/2014

mt88 would recommend this product to a friend

after 2months battle with algae, system running with algae scrubber, refugium, large protein skimmer, with all that running I decided to install and use this product, never thought it would work but after 5 days came back from vacation things really improved and all my sps corals starting to look happy and fish get to eat a little more food.
Thank you BRS!

Great ProductBy Evelioon 12/9/2014

Evelio would recommend this product to a friend

I have used several different types of GFO products and this one gives us the best performance vs cost

Great productBy dolpatoron 11/23/2014

dolpator would recommend this product to a friend

This is the only GFO that I use, it keeps my phosphates levels low to nothing. I use it with BRS media reactor with out issues. Great product would recommend it to any one needing g to remove phosphate in their systems

Previously Asked Questions

by Brandon on October 4, 2013, @12:46 PM

How much do u start out with in your reactor? Is there a measurement per gallon ratio?

Bulk Reef Supply
Hi Brandon,
It depends on how large your tank is. The easiest way to do the math is to use our reef calculator at the link below. You enter the size of the tank and the type of GFO you want to use, it will tell you how much GFO to add.

Can the HC GFO tumble more than the standard, higher flow? I am also using the filter pads on the top to help keep the particles in better. Your thoughts would be great.

Bulk Reef Supply
Hi Chad,
The GFO HC is a denser/harder product which means it can handle more flow without breaking down (though at the same flow, its tumbling characteristics would be about the same). If you are trying to increase flow you could also remove the sponge pads in the reactor when using GFO.

Does the high capacity GFO have to be tumbled in a reactor or could I place it in a media bag and put it in a high flow area of my sump?

Bulk Reef Supply
Hey Kevin,
It is best when tumbled in a fluidized bed reactor as the media otherwise has a tendency to harden into a brick, but even placed in a filter sock would be better then nothing.

Bulk Reef Supply
Hey Scott,
There isn't any minimum size limit to the high capacity gfo. It can be used in any aquarium it just happens to be more popular in larger tanks because you don't need as much media. Its handy when your trying to keep the equipment smaller while still maintaining the same effect.

Granular GFO is varied in its shapes and requires the least amount of flow to tumble. Good for reactors.

High Capacity GFO is twice as dense as Granular GFO, so twice as much material will fit into a reactor. It's extremely hard and has less dust to begin with. Fewer fines will be created during use and transportation. By volume, High Capacity GFO will remove roughly twice the phosphate compared to the same volume of Granular GFO. Best overall performance.

Special note on fighting existing algae problems: Algae needs three main nutrients to grow: phosphate, nitrate and light. Reducing any one of these will significantly slow down algae growth but may not completely solve your issue. Once algae takes hold, it can be a difficult battle but it is winnable. The best offense against algae is to take preventative measures and attack nutrient before an outbreak is apparent. Use the following suggestions and be aggressive if an algae problem is already present:

Maintain undetectable phosphate levels with good feeding habits and use a phosphate remover like GFO. 99% of all phosphate is added to the tank via foods.

Control nitrate levels by reducing feedings, increasing the water change schedule and maintaining a properly sized protein skimmer.

Use nutrient free RO/DI water for water changes and top off water

Shorten your lighting period or intensity. In some cases aquarists have found replacing old bulbs that have fallen out of their intended spectrum helps as well.

Continuously remove as much algae as possible by hand.

Add predators - nothing helps an algae outbreak as much as critters who eat it all day long. Various tangs, lawn mower blennies, crabs and snails are all good options. It is also theorized that a healthy pod population will also control algae growth before it gets a chance to take root.

Ask a question

Previously Asked Questions

by Brandon on October 4, 2013, @12:46 PM

How much do u start out with in your reactor? Is there a measurement per gallon ratio?

Bulk Reef Supply
Hi Brandon,
It depends on how large your tank is. The easiest way to do the math is to use our reef calculator at the link below. You enter the size of the tank and the type of GFO you want to use, it will tell you how much GFO to add.

Can the HC GFO tumble more than the standard, higher flow? I am also using the filter pads on the top to help keep the particles in better. Your thoughts would be great.

Bulk Reef Supply
Hi Chad,
The GFO HC is a denser/harder product which means it can handle more flow without breaking down (though at the same flow, its tumbling characteristics would be about the same). If you are trying to increase flow you could also remove the sponge pads in the reactor when using GFO.

Does the high capacity GFO have to be tumbled in a reactor or could I place it in a media bag and put it in a high flow area of my sump?

Bulk Reef Supply
Hey Kevin,
It is best when tumbled in a fluidized bed reactor as the media otherwise has a tendency to harden into a brick, but even placed in a filter sock would be better then nothing.

Bulk Reef Supply
Hey Scott,
There isn't any minimum size limit to the high capacity gfo. It can be used in any aquarium it just happens to be more popular in larger tanks because you don't need as much media. Its handy when your trying to keep the equipment smaller while still maintaining the same effect.

Full Details

Two Types of GFO:

Granular GFO is varied in its shapes and requires the least amount of flow to tumble. Good for reactors.

High Capacity GFO is twice as dense as Granular GFO, so twice as much material will fit into a reactor. It's extremely hard and has less dust to begin with. Fewer fines will be created during use and transportation. By volume, High Capacity GFO will remove roughly twice the phosphate compared to the same volume of Granular GFO. Best overall performance.

Special note on fighting existing algae problems: Algae needs three main nutrients to grow: phosphate, nitrate and light. Reducing any one of these will significantly slow down algae growth but may not completely solve your issue. Once algae takes hold, it can be a difficult battle but it is winnable. The best offense against algae is to take preventative measures and attack nutrient before an outbreak is apparent. Use the following suggestions and be aggressive if an algae problem is already present:

Maintain undetectable phosphate levels with good feeding habits and use a phosphate remover like GFO. 99% of all phosphate is added to the tank via foods.

Control nitrate levels by reducing feedings, increasing the water change schedule and maintaining a properly sized protein skimmer.

Use nutrient free RO/DI water for water changes and top off water

Shorten your lighting period or intensity. In some cases aquarists have found replacing old bulbs that have fallen out of their intended spectrum helps as well.

Continuously remove as much algae as possible by hand.

Add predators - nothing helps an algae outbreak as much as critters who eat it all day long. Various tangs, lawn mower blennies, crabs and snails are all good options. It is also theorized that a healthy pod population will also control algae growth before it gets a chance to take root.

Reviews

FRICKIN AWESOMEBy Wrath of Poseidonon 3/6/2015

i have lots of fish lots of corals in a 150g can go 2 months with out what changes

Very HappyBy Benjamin on 3/5/2015

Benjamin would recommend this product to a friend

Been running the HIgh Capacity GFO for two years in two different tanks. On my 90gal. I have the BRS dual reactor with GFO and Carbon. Since running the HIgh Capacity GFO, my phosphate levels are non existant.

Easy and efficient!By Tonyon 2/26/2015

Using with a mix of Rox carbon in my Deluxe BRS reactor and ran clear almost instantly!

Great startBy Kenon 2/14/2015

Ken would recommend this product to a friend

Its the perfect size to get your new GFO reactor off to a great start

Great product, but a bit $$By Submergeon 2/4/2015

Submerge would recommend this product to a friend

You get what you pay for. This GFO works well in a bag in the sump. It doesn't clump if kept in a high flow area. I just massage it around every few days for "general principle". It does a great job at keeping the phosphates low, about 1/10 of what they were before.

Amazing product!By Davidon 1/14/2015

David would recommend this product to a friend

I was continuing to have issues getting my Phosphates down to a negligible amount. I was dosing all sorts of products in an attempt to get the counts down. I installed a BRS Reactor with High Capacity GFO and crossed my fingers. I installed it three days ago and today my reading was 0.05! I can't say enough positive things about this product. Thank you BRS!

I'm sold, will never run without it.By Bruceon 12/14/2014

Bruce would recommend this product to a friend

Was having phosphate issues on my 90g mixed reef tank so I thought I'd give it a try after reading the other reviews....they were right! I am running a BRS single reactor and mix about 1 part High Capacity GFO & 2 parts BRS Premium ROX Carbon. After a week I was convinced my Hanna Checker was broken because it kept coming up 0 phosphates...there was nothing wrong with my Hanna. Been using this about 6 months now and have had no phosphate issues or no ill side effects. I didn't think I really needed the carbon but carbon is cheap and has it's benefits, and with the mix you don't have the hassle of tweaking the flow to try to maintain the right amount of tumble.

BRS BULK GFO-High CapacityBy mt88on 12/13/2014

mt88 would recommend this product to a friend

after 2months battle with algae, system running with algae scrubber, refugium, large protein skimmer, with all that running I decided to install and use this product, never thought it would work but after 5 days came back from vacation things really improved and all my sps corals starting to look happy and fish get to eat a little more food.
Thank you BRS!

Great ProductBy Evelioon 12/9/2014

Evelio would recommend this product to a friend

I have used several different types of GFO products and this one gives us the best performance vs cost

Great productBy dolpatoron 11/23/2014

dolpator would recommend this product to a friend

This is the only GFO that I use, it keeps my phosphates levels low to nothing. I use it with BRS media reactor with out issues. Great product would recommend it to any one needing g to remove phosphate in their systems

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